Cylinder relief-valve.



Patented Sept. 7, 1909.

0. P. WHITE.

CYLINDER RELIEF VALVE.

APPLICATION FILED MAY 10, 1909.

5mm l for.

attouwgo CHARLES P. WHITE, 0F GREENSBOBO NORTH CAROLINA.

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Specification of Letters Patent.

Patented Sept. 7, 1909.

Application filed Kay 10, 1909. Serial No. 494,899.

To all whom it concern:

Be'it known that I, CHARLES P. WHITE, a citizen of the United States,residing at Greensboro, in the county of Guilford and State of NorthCarolina, have invented a new and useful Cylinder Relief-Valve, of whichthe following isa specification.

This invention relates to improvements in cylinder relief valves of thatkind which open automatically when steam is shut off in the cylinder,and which close when steam is turned thereinto.

It is the object of the present invention to provide a valve of the kindstated which is simple in structure, and efficient in operation, andalso to provide a valve which may be opened, when necessary, by fluidpressure.

With the foregoing ob ects in view the in vention consists in a novelconstruction and arrangement of parts to be hereinafter described andclaimed, reference being had to the drawing hereto annexed forming apart of this specification, in which drawing Figure 1 is a longitudinalsectional view of a steam engine cylinder showing the application of theinvention, the relief valves being shown in elevation. Fig. 2 is anenlarged vertical sectional view of one of the relief valves.

In the drawings, 5 denotes a steam engine cylinder, and 6 are the steamports to the respective ends thereof. Each end of the cylinderis-equipped with the relief valve which is the subject of the presentinvention,

' and as said valves are identical in structure and in operation, adescription of onewill sufiice for both.

At'7 is indicated the casing of the relief valve, said casing beingprovided .with a threaded nipple 8 screwing into the cylinder wall,whereb said casing is mounted on the cylinder. T e bore 9 of the casingopens into the bore of the cylinder.

The valve casing is provided with an outlet 1O fitted with a dischargepipe 11, and adjacent to this outlet, a partition 12 extends across thebore of the casing. This partition has a concavity on one side in whichis adapted to seat a ball 13. The outlet is so located with respecttothe partition, that when the ball is seated as stated, it also closesthe outlet, the ball thus forming a valve which controls the outlet 10.The ball 13 is formed with a stem 14 which extends through a centralopening in the partition 12, and carries a piston .15 which works inthat portion of the bore 9 on that side of the partition opposite thaton which the ball seats.

Between the piston 15 and the partition 12, the casing 7 is entered by apipe 16 which leads from one of the ports 6 of the cylinder 5. The fpipe16 of one of the relief valves extends rom one of the steam orts, andthe pipe 16 of the other relief va ve extends to the other port, therelief valves being thus connected to the steam port'of that end of thecylinder on which they are mounted.

Between the end wall of the casing 7 and the piston 15, the bore of thecasing contains aspringl? which bears against the i'ston and serves tomove the same in a direction to open the valve 13 when pressure is shutoff from the piston. The pipe 16 enters the casing 7 on one side of thepiston, and the spring engages the opposite side thereof. The casing onthe last-mentioned side of the piston is also entered by a pipe 18leadin from the boiler, or a source of compresse air. This portion ofthe valve casingis also provided with a vent valve 19 which is nor mallyheld closed by a spring 20.

. The operation of the relief valve is as follows: When the engineeropens the throttle, the steam ports 6 are alternately placed incommunication with the res ective relief valves, the steam being carrieto the casin 7 through the pipe 16, and entering sai casing abovev thepiston 15 whereby it is moved downwardly in a direction to close thevalve 13. When steam is shut ofi in the cylinder, the spring 17 movesthe piston 15 in a direction to open the valve whereupon the water ofcondensation is permitted to escape through the discharge pipe 11. Inorder to prevent the valve 13 from entering the cylinder 5 in case thestem 14 should break 011", there is mounted in the bore 9, a

suitable distance above the valve, a transverselv extending. pin 21. Ifthe spring 17 shoul fail to open the valve, pressure may be let into thecasing 7 below the 'piston through the ipe 18. The vent 19 is for thepurpose of a ording escape of any condensation which may leak past thevalve and piston. The vent can be readily opened upon pushing againstthe same by a pin or other suitable devlce. p

A relief valve constructed as herein described has no com licated partsto get out of order, and it is e cient and entirely automatlc inoperation requirin no attention save an occasionalopening o the vent.

What is claimed is:

1. The combination with a steam engine cylinder, of a relief valve,comprising a casing in communication with the cyhnder,

and having an outlet, a normally open valve controlling the outlet, apiston connected to the valve, and a connection between the valve casingand a steam port of the cylinder for operating the iston to close thevalve when steam is admitted into the cylinder.

2. The combination with a steam engine cylinder, of a relief valve,comprising a casing in communication with the cylinder,

' and having an outlet, a normally open valve outlet on one side of thepartition, said partition having an opening, a normally open valvecontrolling the aforesaid outlet, and provided with a stem extendingthrough the opening in the partition, a piston carried by the stem, aconnection between one of the steam ports of the cylinder, and thecasing on one side of the piston, and a spring en gageable with theother side of the piston.

4:. The combination with a steam engine cylinder, of a relief valvecomprising a casing containing a artition, and having an outlet on oneside 0% said partition, the partition havin an opening, a normally openvalve contro ling the aforesaid outlet, and provided With a stemextending through the opening in the partition, a piston carried by thestem, a connection between one of the steam ports of the cylinder andthe casing on one side of the piston, and a fluid pressure supply pipeentering the casing on the opposite side of the piston.

5. The combination with a steam engine cylinder, of a relief valvecomprising a casing containing a partition having on one side aconcavity and an opening, said casing having an outlet adjacent to thepartition, a spherical valve seating in the concavity of the partition,and covering the outlet when seated, a. stem extending from the valvethrough the opening in the partition, a piston carried by the stem, aconnection between one of the steam ports of the cylinder and the casingon one side of the piston, and a spring engaging the other side of thepiston for holding the valve normally open.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

CHARLES P. WHITE.

Witnesses: E. L. Sums,

lV. P. HUTTON.

